simple DTrace ustack helper

nodejs · Dec 16, 2011 · b9049d2 · b9049d2
1 parent d6bae2c
commit b9049d2
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Showing 3 changed files with 737 additions and 4 deletions.
diff --git a/src/v8constants.h b/src/v8constants.h
@@ -0,0 +1,83 @@
+/*
+ * The following offsets are derived from the V8 3.6.6.14 source.  A future
+ * version of this helper will automatically generate this file based on the
+ * debug metadata included in libv8.  See v8ustack.d for details on how these
+ * values are used.
+ */
+
+#ifndef V8_CONSTANTS_H
+#define	V8_CONSTANTS_H
+
+#if defined(__i386)
+
+/*
+ * Frame pointer offsets
+ */
+#define	V8_OFF_FP_FUNC		(-0x8)
+#define	V8_OFF_FP_CONTEXT	(-0x4)
+#define	V8_OFF_FP_MARKER	(-0x8)
+
+/*
+ * Heap class->field offsets
+ */
+#define	V8_OFF_HEAP(off)	((off) - 1)
+
+#define	V8_OFF_FUNC_SHARED	V8_OFF_HEAP(0x14)
+#define	V8_OFF_SHARED_NAME	V8_OFF_HEAP(0x4)
+#define	V8_OFF_SHARED_INFERRED	V8_OFF_HEAP(0x24)
+#define	V8_OFF_SHARED_SCRIPT	V8_OFF_HEAP(0x1c)
+#define	V8_OFF_SHARED_FUNTOK	V8_OFF_HEAP(0x4c)
+#define	V8_OFF_SCRIPT_NAME	V8_OFF_HEAP(0x8)
+#define	V8_OFF_SCRIPT_LENDS	V8_OFF_HEAP(0x28)
+#define	V8_OFF_STR_LENGTH	V8_OFF_HEAP(0x4)
+#define	V8_OFF_STR_CHARS	V8_OFF_HEAP(0xc)
+#define	V8_OFF_CONSSTR_CAR	V8_OFF_HEAP(0xc)
+#define	V8_OFF_CONSSTR_CDR	V8_OFF_HEAP(0x10)
+#define	V8_OFF_EXTSTR_RSRC	V8_OFF_HEAP(0xc)
+#define	V8_OFF_FA_SIZE		V8_OFF_HEAP(0x4)
+#define	V8_OFF_FA_DATA		V8_OFF_HEAP(0x8)
+#define	V8_OFF_HEAPOBJ_MAP	V8_OFF_HEAP(0x0)
+#define	V8_OFF_MAP_ATTRS	V8_OFF_HEAP(0x8)
+
+#define	NODE_OFF_EXTSTR_DATA	0x4
+
+/*
+ * Stack frame types
+ */
+#define	V8_FT_ENTRY		0x1
+#define	V8_FT_ENTRYCONSTRUCT	0x2
+#define	V8_FT_EXIT		0x3
+#define	V8_FT_JAVASCRIPT	0x4
+#define	V8_FT_OPTIMIZED		0x5
+#define	V8_FT_INTERNAL		0x6
+#define	V8_FT_CONSTRUCT		0x7
+#define	V8_FT_ADAPTOR		0x8
+
+/*
+ * Instance types
+ */
+#define	V8_IT_FIXEDARRAY	0x9f
+
+/*
+ * Identification masks and tags
+ */
+#define	V8_SmiTagMask		0x1
+#define	V8_SmiTag		0x0
+#define	V8_SmiValueShift	V8_SmiTagMask
+
+#define	V8_IsNotStringMask	0x80
+#define	V8_StringTag		0x0
+
+#define	V8_StringEncodingMask	0x4
+#define	V8_AsciiStringTag	0x4
+
+#define	V8_StringRepresentationMask	0x3
+#define	V8_SeqStringTag		0x0
+#define	V8_ConsStringTag	0x1
+#define	V8_ExternalStringTag	0x2
+
+#else
+#error "only i386 is supported for DTrace ustack helper"
+#endif
+
+#endif /* V8_CONSTANTS_H */